Multidecadal Basal Melt Rates and Structure of the Ross Ice Shelf, Antarctica, Using Airborne Ice Penetrating Radar ...

• Main Authors: Das, Indrani, Padman, Laurie, Bell, Robin E., Fricker, Helen A., Tinto, Kirsteen J., Hulbe, Christina L., Siddoway, Christine S., Dhakal, Tejendra, Frearson, Nicholas P., Mosbeux, Cyrille, Cordero, S. Isabel, Siegfried, Matthew R.
• Format: Article in Journal/Newspaper
• Language: unknown
• Published: Columbia University 2020
• Subjects: Geophysics; FOS: Earth and related environmental sciences; Geomorphology; Ice shelves; Ice sheets; Ice sheets > Remote sensing; Antarctic; Ross Ice Shelf; The Antarctic; Antarc*; Antarctica; Ice Sheet; Ice Shelf; Ice Shelves
• Online Access: https://dx.doi.org/10.7916/d8-7gg2-bw28; https://academiccommons.columbia.edu/doi/10.7916/d8-7gg2-bw28

Basal melting of ice shelves is a major source of mass loss from the Antarctic Ice Sheet. In situ measurements of ice shelf basal melt rates are sparse, while the more extensive estimates from satellite altimetry require precise information about firn density and characteristics of near‐surface layers. We describe a novel method for estimating multidecadal basal melt rates using airborne ice penetrating radar data acquired during a 3‐year survey of the Ross Ice Shelf. These data revealed an ice column with distinct upper and lower units whose thicknesses change as ice flows from the grounding line toward the ice front. We interpret the lower unit as continental meteoric ice that has flowed across the grounding line and the upper unit as ice formed from snowfall onto the relatively flat ice shelf. We used the ice thickness difference and strain‐induced thickness change of the lower unit between the survey lines, combined with ice velocities, to derive basal melt rates averaged over one to six decades. Our ...